whiton



(No Model.)

D. E. su L. E. WHITON.

LATHE CHUCK.

Patentedreb. ze, 1884. Y

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DAVID E. WHITON AND LUOIUS E. WHITON, OF W'EST STAFFORD, CONN.

LATHE-CHUCK..

SPECIFICATION forming part of Letters Patent No. 294,296, dated February 2G, 18,84.

Application tiled May 9, 1853. (No model.)

`Improvement in Lathe-Chucks, of which the .following is a specication and description.

Our invention relates to that class of lathechucks whose jaws are moved radially in guide ways or slots made in the front face of the shell or case by a rotary disk 'operated by pinions within the shell, and provided with a convolute or scroll thread made on its outer face, which engages in the 'teeth made lon the back side of each jaw.

The object of our invention is to secure the greatest strength, durability, `and accuracy in and to completely inclose all the actuating parts, to give easy access to the same when desired, and to provide means to secure the back plate to the shell at the same time the chuck is secured to the chuck-plate. We accomplish this by the mechanism substantially as hereinafter described, and illustrated in the accompanying` drawings, in'which- Figure I is a front view of achuck made according to our inventionshowing the jaws, the guideways in which they are moved, and

the scroll which actuates them. Fig. II is aV rear view of the same, showing the back plate secured in place in the shell by the bolts or screws. Fig. III is a longitudinal section of the chuck at line A. Fig. IVis a section of a portion of the chuck at -line B, showing the method of securing the back plate to the shell. Fig. V is a view of the inside of the chuck with the back plate removed, and showing the operating-pinions and the toothed scrolldisk, and Fig. VI is a view of the inside face ofthe back plate, showing the bearings for the inner journals of the pinions.

In the drawings, 2 represents the shell or Y case of the chuck, which is open at its rear end, with a back plate, 3, snugly fitted in the open end, and secured therein1 by screws or bolts fitted into holes 23, one half of each said hole being made in the edge of the back plate, and the other half being made in the inner edge of the open end of the shell.' Radial guideways 7 are made in the front face of the shell .2, which guideways extend entirely through the shell and into the annular recess 27, made in the'inside of the shell, to receive the disk 4, on whose outer face is made a convolute or scroll thread, 5, which engages with the teeth made on the back side of' the jaws 8,

` as shown clearly in Fig. III. This disk fits well the recess 27, but so as to revolve freely therein, and its inner face is provided with beveled teeth 6, extending all around, as shown clearly in Fig..V.

The operating-pinions 26,V ofV which there may be three, have their teeth beveled to fit the beveled teeth of the disk 4, and the outer journal, 13, of each pinion is of the same taperA as that of its beveled teeth 26,but in the opposite direction, and has a bearing in a tapered hole, 14, made through the shell 2, the outer end of the journal 13 being smallest in diameter, and of prismatic form, to receive an operating-key; and theinner journal, 12, has a bearing in a recess, l9, made in the back plate, .3. By making the bearings or holes for the pinions of a tapered form and in the shell Y itself and the journals of the pinions'of corresponding tapered form, we are enabled to insert the pinions into place from the inside, with a very small joint exposed on the outside of the shell, and the beveled teeth of the pinions, when in place, engage with the beveled impinges against the inner face of an annular iiange, 25, extendingaround the inside of the disk and around the outside of the central hole, 17, which is made entirely through the chuck at its axis; and when the back plate,3,

its axis as the incline or bevel of its teeth and IOO make room for the teeth of the pinion.

The outer rim of the back plate, where it fits into the shell, is shown at 10, and is se` cured to the shell by inserting` the bolts or screws 21 through the plate. For the smaller sizes weprei'er to thread the holes 23 and insert screws through the plate and turn them into the threaded holes; but for the larger sizes we prefer to mill out a curved cavity, 18, (shown in Fig. III and also in dotted lines in Fig. Vf) and instead of threading the holes 23 at the joint between the back plate and the shell, we leave the holes smooth and place a bolt, with its outer end threaded, upon which to turn a nut. W'hen the bolt is in place, its head 20 on one side impiuges against the inner wall of this cavity, andthe bolt is thus held firmly by its position in the hole; and when the nut is turned up to its bearing against the plate, in securing the latter in place ou the rear end of the chuck, the bolt cannot turn.

It is evident that by making the shell solid or in one piece at the bearings of the pinions we produce a much stronger chuck, and the bearings of the pinions are much more accurate and durable, and at the same time lessen the expense of manufacture; and when constructed as above described the liability of the parts getting out of order or disarranged is reduced in a great degree.

Having thus described our invention, what we claim as new is- 1. In a'geared scroll-chuck, the shell or case 2, provided with tapered holes for pinionbearings, in combination with a series of pinions, eaeh having a tapered j ournal to revolve in one of said tapered holes in the shell, and a back plate itted to the open rear end of said shell, substantially as described.

2. In a geared scroll-chuck, the shell or ease 2, having its rear end open, in combination with a back plate fitted into said open end, and holes made partly in said plate and partly in said shell at the joint, and screw bolts adapted to extend through the chuck-plate of a lathe and fitted into said holes, whereby said back plate is secured in place and the chuck secured to the chuck-plate of the lathe by the same set of screw-bolts, substantially as described.

3. In a geared scroll-chuck, the shell or ease 2, provided with tapered holes for pinionbearings, in combination with a back plate fitted and secured in the open end of said shell, ahseries of pinions, each having its outer journal tapered and adapted to revolve in one of the tapered holes in said shell, and its inner journal supported in a bearing in said back plate, the toothed scroll-disk, the jaws adapted to move in the radial guideways,and the screwbolts fitted to the holes at the joint in the back plate and the shell or ease, and adapted to exv DAVID E. VYTHITON. LUCIUS E. VHITON.

Vitiiesses:

T. A. CUR'ris, Guns. H. Woon. 

